There's One, Only!

Another groaner

Here's one that I've seen around a few times before:

The Old Cowboy

A tough old cowboy once counseled his grandson that if he wanted to
live a long life, the secret was to sprinkle a little gunpowder on his
oatmeal every morning.

The grandson did this religiously and he lived to the age of 93.

When he died, he left 14 children, 28 grandchildren, 35 great
grandchildren and a fifteen foot hole in the wall of the crematorium.